Bryan,
It's not stainless steel, but take a look at the One Ocean carbon fiber rudder plans. I have spent three evenings working on it so far, and the rudder blade and the other parts are laminated and shaped. I'm very pleased with the rudder.
It's light, stiff, and has an airfoil cross section.

: last weekend i asked my uncle(welder and all around talented guy) to help me
: make an aluminum rudder ,he was enthusiastic but wanted to use some
: stainless steel (1/16inch)he has lying around.i coudlnt think of a reason
: why not i was wondering if anyone has an opinion for or against. Any
: thoughts would be appreciated.

: PS im still looking for a good rudder plan anyone have a lead for me?